Chapter 4 WAN
Basic Home Station VDSL2 P8802T User’s Guide
100
By implementing PPPoE directly on the VDSL Router (rather than individual computers), the
computers on the LAN do not need PPPoE software installed, since the VDSL Router does that part
of the task. Furthermore, with NAT, all of the LANs’ computers will have access.
RFC 1483
RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM Adaptation Layer 5
(AAL5). The first method allows multiplexing of multiple protocols over a single ATM virtual circuit
(LLC-based multiplexing) and the second method assumes that each protocol is carried over a
separate ATM virtual circuit (VC-based multiplexing). Please refer to RFC 1483 for more detailed
information.
Multiplexing
There are two conventions to identify what protocols the virtual circuit (VC) is carrying. Be sure to
use the multiplexing method required by your ISP.
VC-based Multiplexing
In this case, by prior mutual agreement, each protocol is assigned to a specific virtual circuit; for
example, VC1 carries IP, etc. VC-based multiplexing may be dominant in environments where
dynamic creation of large numbers of ATM VCs is fast and economical.
LLC-based Multiplexing
In this case one VC carries multiple protocols with protocol identifying information being contained
in each packet header. Despite the extra bandwidth and processing overhead, this method may be
advantageous if it is not practical to have a separate VC for each carried protocol, for example, if
charging heavily depends on the number of simultaneous VCs.
Traffic Shaping
Traffic Shaping is an agreement between the carrier and the subscriber to regulate the average rate
and fluctuations of data transmission over an ATM network. This agreement helps eliminate
congestion, which is important for transmission of real time data such as audio and video
connections.
Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This parameter may
be lower (but not higher) than the maximum line speed. 1 ATM cell is 53 bytes (424 bits), so a
maximum speed of 832Kbps gives a maximum PCR of 1962 cells/sec. This rate is not guaranteed
because it is dependent on the line speed.
Sustained Cell Rate (SCR) is the mean cell rate of each bursty traffic source. It specifies the
maximum average rate at which cells can be sent over the virtual connection. SCR may not be
greater than the PCR.
Maximum Burst Size (MBS) is the maximum number of cells that can be sent at the PCR. After MBS
is reached, cell rates fall below SCR until cell rate averages to the SCR again. At this time, more
cells (up to the MBS) can be sent at the PCR again.
If the PCR, SCR or MBS is set to the default of "0", the system will assign a maximum value that
correlates to your upstream line rate.
Содержание P8802T
Страница 10: ...Table of Contents Basic Home Station VDSL2 P8802T User s Guide 10...
Страница 11: ...11 PART I User s Guide...
Страница 12: ...12...
Страница 58: ...Chapter 2 User Setup Guide Basic Home Station VDSL2 P8802T User s Guide 58...
Страница 59: ...59 PART II Technical Reference...
Страница 60: ...60...
Страница 74: ...Chapter 3 Device Info Screens Basic Home Station VDSL2 P8802T User s Guide 74...
Страница 120: ...Chapter 6 Network Address Translation NAT Basic Home Station VDSL2 P8802T User s Guide 120...
Страница 150: ...Chapter 10 DNS Setup Basic Home Station VDSL2 P8802T User s Guide 150...
Страница 160: ...Chapter 11 UPnP Basic Home Station VDSL2 P8802T User s Guide 160...
Страница 168: ...Chapter 12 USB Services Basic Home Station VDSL2 P8802T User s Guide 168...
Страница 180: ...Chapter 14 Wireless Basic Home Station VDSL2 P8802T User s Guide 180 Figure 75 Wireless Security...
Страница 200: ...Chapter 14 Wireless Basic Home Station VDSL2 P8802T User s Guide 200...
Страница 204: ...Chapter 15 Voice Basic Home Station VDSL2 P8802T User s Guide 204...
Страница 240: ...Chapter 16 Diagnostic Basic Home Station VDSL2 P8802T User s Guide 240...
Страница 244: ...Chapter 17 Settings Basic Home Station VDSL2 P8802T User s Guide 244...
Страница 248: ...Chapter 18 Log Basic Home Station VDSL2 P8802T User s Guide 248...
Страница 252: ...Chapter 19 TR 069 Client Basic Home Station VDSL2 P8802T User s Guide 252...
Страница 254: ...Chapter 20 Internet Time Basic Home Station VDSL2 P8802T User s Guide 254...
Страница 256: ...Chapter 21 Access Control Basic Home Station VDSL2 P8802T User s Guide 256...
Страница 260: ...Chapter 23 Reboot Basic Home Station VDSL2 P8802T User s Guide 260...
Страница 268: ...Chapter 24 Troubleshooting Basic Home Station VDSL2 P8802T User s Guide 268...
Страница 272: ...Appendix A Legal Information Basic Home Station VDSL2 P8802T User s Guide 272...